<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <button @click="showStore">显示仓库的内容</button>
        <!-- <h1>{{this.$store.state.counter}}</h1> -->
        <h1>{{counter}}</h1>
        <button @click="add">加1</button>
    </div>
</body>
<script src="./node_modules/vue/dist/vue.js"></script>
<!-- 1. 引入 vuex 依赖 -->
<script src="./node_modules/vuex/dist/vuex.js"></script>
<script>
    console.log(Vuex);
    /* 2. 创建仓库 */
    let store = new Vuex.Store({
        // 仓库中的数据
        state:{
            counter:555
        },
        // 改变值的操作
        mutations:{
            increment:function(state){
                state.counter+=1;
            }
        }
    })
    // Vue.use(Vuex);
    let vm = new Vue({
        /* 3. 配置仓库 */
        store,
        // computed: {
        //     counter:function(){
        //         return this.$store.state.counter;
        //     }
        // },
        // computed: Vuex.mapState(["counter"]),
        computed: {
            totalPrice:function(){},
            // ...{counter:555}
            // counter:555
            ...Vuex.mapState(["counter"])
        },
        el:"#app",
        methods: {
            showStore:function(){
                console.log(this.$store);    
            },
            add:function(){
                // this.$store.state.counter +=1; 直接修改 不推荐
                // 提交 commit 修改数据
                this.$store.commit("increment")
            }
        },
    })
</script>
</html>